Automobile stamping welding fixture

Abstract

This invention relates to the field of automotive stamping welding technology, specifically to a welding fixture for automotive stamping parts, comprising: a clamping mechanism on a drive platform, an assembly mechanism above the clamping mechanism, and a detection mechanism on the assembly mechanism; this invention can achieve stable horizontal positioning of the center of the wheel spoke and vertical positioning of the wheel rim, and implement unified concentric positioning of the wheel spoke and wheel rim, and can simultaneously apply balanced downward pressure to the center and outer edge of the wheel spoke, and can simultaneously apply uniform radial pressure to the inner side of the outer edge of the wheel spoke; it can also effectively detect the assembly gap between the two and the deformation state during the stress release process of the wheel spoke; it can also effectively rigidly limit all spatial degrees of freedom of the wheel spoke and wheel rim that may cause relative misalignment; it can enable the wheel spoke and wheel rim assembly to be directly welded without the need for transportation, transfer and secondary clamping.

Description

Technical Field

[0001] This invention relates to the field of automotive stamping welding technology, specifically to a welding fixture for automotive stamping parts. Background Technology

[0002] Automobile wheels are mainly composed of two structural components: spokes and rims. The two are generally assembled and welded together. The spokes, as the core support and force transmission components, are generally used to connect the central mounting plate and the rim. The rim is the assembly base for the tire, and its structure is directly related to the tire's sealing, support, and the overall driving performance of the vehicle.

[0003] In existing technologies, when assembling and welding wheel spokes and rims, the rim is first limited by a clamping device. Then, the wheel spokes placed inside the rim are pressed down vertically by a pressing assembly device, causing the outer edge of the wheel spokes and the inner wall of the rim to undergo controllable elastic compression deformation at corresponding positions. The radial tension force generated by the deformation and reset of the two achieves temporary tight assembly and locking. Finally, a robotic arm or automated welding gun is used to weld along the edge where the wheel spokes and the inner wall of the rim are in close contact, thereby stably fixing the assembled wheel spokes and rim.

[0004] However, traditional methods of assembling spokes and rims have the following problems: 1. In existing technologies, the vertical pressure of the pressing assembly equipment is usually concentrated in the middle area of ​​the spokes, failing to simultaneously and directly control the outer edge of the spokes that is in contact with the inner wall of the rim. This means that the downward movement and deformation of the outer edge of the spokes can only be driven by indirect forces transmitted from the middle, making it difficult to accurately and uniformly control the movement trajectory and deformation of the outer edge of the spokes. Furthermore, during the vertical pressing and deformation tightening process of the spokes, the inner side of the outer edge of the spokes lacks uniform radial pressure to ensure a tight fit with the inner wall of the rim. Because the outer edge of the rim lacks rigid support, it is more prone to irregular deformation when subjected to pressure from the outer edge of the spokes. This makes the elastically restorative fit between the spokes and rim susceptible to gaps or uneven pressure. Furthermore, it is impossible to effectively monitor the gaps between the spokes and rim during assembly, or to detect unstable deformations during stress release. Consequently, the initial fit gap between the spokes and rim negatively impacts the uniformity of welding heat input, the stability of the molten pool, and the final weld quality and strength. Negative impacts: 2. In existing technologies, since the assembly and welding of wheel spokes and rims are two independent processing tasks, in order to control the fixture cost of the assembly station, facilitate rapid loading and unloading of workpieces, and ensure the stable release of internal stress in the assembled wheel spokes and rims, the clamping operation of the assembly station is usually intentionally simplified. This results in the lack of effective limits on the wheel rim and spokes in multiple spatial degrees of freedom during the pressing of the wheel spokes and rims and the resetting and lifting action of the pressing equipment. Consequently, the wheel spokes and rims, which undergo automatic deformation and resetting, are prone to uncontrollable deformations due to the lack of limit constraints. Relative misalignment directly affects the perpendicularity and concentricity of the spokes and rim, causing spoke and rim assemblies with potential initial defects to be directly transported to subsequent welding processes. Although high-cost precision fixtures at the welding station can force mechanical correction of spoke and rim assemblies with assembly errors, the correction process usually involves introducing greater assembly stress to cover up or counteract existing deviations. This may only achieve forced alignment of local positions of the spokes and rim, but cannot solve the fundamental problem of uneven pressure and clearance distribution on the entire mating surface of the spokes and rim caused by misalignment. Summary of the Invention

[0005] To achieve the above objectives, the present invention provides the following technical solution: a welding fixture for automotive stamping parts, comprising a drive platform, characterized in that: a clamping mechanism is provided on the drive platform, an assembly mechanism is provided above the clamping mechanism, and a detection mechanism is provided on the assembly mechanism.

[0006] The clamping mechanism includes an electric turntable rotatably mounted on a drive platform. The electric turntable is provided with a horizontal positioning part, and the electric turntable and the horizontal positioning part are jointly provided with an alignment locking part. The electric turntable is provided with a transverse drive part, and the transverse drive part is provided with a concentric limiting part.

[0007] The horizontal positioning part, in conjunction with the concentric limiting part, precisely locks the horizontal spokes and the vertical rim into a vertical and concentric positional relationship.

[0008] The assembly mechanism includes a lifting shaft located above the electric turntable, and a pressing assembly part is provided on the lower side of the lifting shaft. The pressing assembly part and the horizontal positioning part are used to vertically press and assemble the horizontal wheel spokes. An inner support fitting part is provided on the pressing assembly part, and the inner support fitting part is used to synchronously and evenly press the inner side of the outer edge of the wheel spokes.

[0009] The detection mechanism includes an outer edge stabilizing part installed on the inner support fitting part and detecting the shape change of the outer edge of the wheel spoke during assembly and unloading. The outer edge stabilizing part presses down on the outer edge of the wheel spoke simultaneously. The inner support fitting part and the outer edge stabilizing part are both provided with a lifting adjustment part, and the lifting adjustment part is provided with a gap detection part for detecting the assembly gap between the wheel spoke and the wheel rim.

[0010] Preferably, the horizontal positioning part includes an adjusting shaft slidably disposed on the electric turntable, a fixed plate elastically connected to the electric turntable is fixedly disposed on the upper side of the adjusting shaft, a support plate is fixedly disposed on the upper side of the fixed plate through a connecting rod, and a pneumatic clamp is fixedly disposed on the inner side of the support plate.

[0011] Preferably, the alignment locking part includes an insertion hole at the lower end of the adjusting shaft, and an electric push rod is fixedly provided on the lower side of the electric turntable. The telescopic end of the electric push rod is fixedly provided with a pin that engages with the insertion hole.

[0012] Preferably, the transverse drive unit includes two fixed platforms symmetrically fixed on the upper side of the electric turntable. A cylinder is fixedly installed on each of the two fixed platforms on opposite sides, and a connecting plate is fixedly installed on the telescopic end of the cylinder.

[0013] Preferably, the concentric limiting part includes a pressure-stabilizing half-ring and an outer support half-ring, which are fixedly arranged on opposite sides of two connecting plates. The splicing axis of the two pressure-stabilizing half-rings and the two outer support half-rings coincides with the axis of the pneumatic clamp. The lower end of the opposite side of the two pressure-stabilizing half-rings is an inclined surface.

[0014] Preferably, the pressing assembly includes a movable disk fixedly disposed on the lower side of the lifting shaft, a plurality of abutting sleeves are evenly fixedly disposed on the lower side of the movable disk, a sliding rod is slidably disposed on both the abutting sleeves and the movable disk, and a pressure plate elastically connected to the movable disk is fixedly disposed on the lower side of all the sliding rods.

[0015] Preferably, the inner support fitting part includes a connecting sleeve fixedly disposed on the outside of the movable disk, a driven disk fixedly disposed on the lower outer side of the connecting sleeve, and an inner support pressure sleeve fixedly disposed on the lower side of the driven disk.

[0016] Preferably, the outer edge pressure stabilizing part includes a plurality of limiting sleeves uniformly fixedly disposed on the upper side of the driven plate, and a second abutting sleeve corresponding to the limiting sleeve is fixedly disposed on the lower side of the driven plate. A second sliding rod is elastically slidably disposed in both the limiting sleeve and the corresponding second abutting sleeve, and a detection pressure ring is fixedly disposed on the lower side of all the second sliding rods.

[0017] Preferably, the lifting adjustment part includes an L-shaped slide rail that is slidably disposed on the outside of the limiting sleeve, and two electric push rods are symmetrically fixedly disposed on the upper side of the driven plate, with the telescopic end of the electric push rods fixedly connected to the corresponding L-shaped slide rail.

[0018] Preferably, the gap detection unit includes a lifting ring that is fixedly disposed on the lower side of all L-shaped carriages. A detection plug is fixedly disposed on the lower side of the lifting ring. The detection plug consists of an annular piece fixedly connected to the lifting ring on the upper side and a plurality of inverted triangular thin pieces evenly distributed on the lower side with pointed ends.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The present invention, through the cooperation of a clamping mechanism, an assembly mechanism, and a detection mechanism, can achieve stable horizontal positioning of the center of the spokes and vertical positioning of the rim before assembly, and implement unified concentric positioning of the spokes and rim to ensure that they maintain high-precision perpendicularity and concentricity in the initial state; after the pressing process of the spokes and rim, a balanced downward pressure can be applied simultaneously to the center and outer edge of the spokes, so that the spokes move down smoothly as a whole, and a uniform radial pressure can be applied simultaneously to the inner side of the outer edge of the spokes, while applying pressure to the outer side of the rim. The appropriate rigid support is provided at the correct position to enable coordinated extrusion molding between the inner and outer surfaces. This ensures that the outer edge of the spokes maintains a uniform and tight fit with the inner wall of the rim throughout the entire process, from the moment it contacts the rim until the deformation is fully recovered. Furthermore, after the spokes and rim are assembled, the assembly gap between them and the deformation state during the stress release process of the spokes can be effectively detected. This data feedback ensures that the accuracy of each assembly is controllable, significantly improving the overall accuracy, uniformity, and consistency of the spokes and rim assembly, and providing a stable and reliable welding foundation for subsequent welding processes.

[0020] 2. This invention, through the cooperation of a clamping mechanism, an assembly mechanism, and a detection mechanism, can effectively and rigidly limit all spatial degrees of freedom of the wheel spokes and rim that may cause relative misalignment during the assembly process after the assembly mechanism completes assembly and begins to reset and lift. This ensures that the relative position of the wheel spokes and rim remains in a preset geometric state throughout the process of releasing internal assembly stress until they reach equilibrium again, thereby stably and accurately maintaining the perpendicularity and concentricity of the wheel spoke and rim assembly. After the pressing device is completely withdrawn, the clamping and locking of the wheel spoke and rim assembly will not be released, but rather... Serving directly as a stable welding workbench, the spoke and rim assembly can be welded directly without the need for conveying, transferring, or secondary clamping. This not only avoids the investment and maintenance costs of independent welding fixtures and material transfer systems, but also avoids external disturbances that may occur to the spoke and rim assembly during transfer. Furthermore, it avoids positioning errors that may be introduced during the secondary clamping and positioning of the spoke and rim assembly. As a result, it significantly improves the production cycle and efficiency of the wheel hub while ensuring the consistency of the accuracy and quality of the welded joints of the spoke and rim assembly, achieving significant optimization of cost, efficiency, and reliability. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention.

[0022] Figure 2 This is a frontal cross-sectional view of the structure of the present invention.

[0023] Figure 3 for Figure 2 Enlarged diagram of point A in the middle.

[0024] Figure 4 for Figure 2 Enlarged diagram of point B in the middle.

[0025] Figure 5 This is a schematic diagram of the clamping mechanism.

[0026] Figure 6 This is a schematic diagram of the horizontal positioning part.

[0027] Figure 7 This is a partial structural diagram of the concentric limiting part.

[0028] Figure 8 This is a schematic diagram of the assembly mechanism.

[0029] Figure 9 This is a partial cross-sectional schematic diagram of the assembly mechanism.

[0030] Figure 10 This is a schematic diagram of the gap detection unit.

[0031] Figure 11 A partial cross-sectional schematic diagram of the assembly structure of the wheel spokes and rim.

[0032] In the diagram: 1. Drive table; 2. Clamping mechanism; 21. Electric turntable; 22. Horizontal positioning part; 221. Adjusting shaft; 222. Fixed plate; 223. Support plate; 224. Pneumatic clamp; 23. Alignment locking part; 231. Insertion hole; 232. Electric push rod one; 233. Pin; 24. Lateral movement drive part; 241. Fixed table; 242. Cylinder; 243. Connecting plate; 25. Concentric limit part; 251. Pressure stabilizing half ring; 252. Outer support half ring; 3. Assembly mechanism; 31. Lifting shaft; 32. Lowering assembly part; 32 1. Moving plate; 322. Clamping sleeve one; 323. Slide rod one; 324. Pressure plate; 33. Inner support fitting part; 331. Connecting sleeve; 332. Driven plate; 333. Inner support pressure sleeve; 4. Detection mechanism; 41. Outer edge pressure stabilizing part; 411. Limiting sleeve; 412. Clamping sleeve two; 413. Slide rod two; 414. Detection pressure ring; 42. Lifting adjustment part; 421. L-shaped slide; 422. Electric push rod two; 43. Gap detection part; 431. Lifting ring; 432. Detection plug; 500. Wheel spoke; 600. Wheel rim. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Please see Figure 1 A welding fixture for automotive stamping parts includes a drive platform 1, a clamping mechanism 2 on the drive platform 1, an assembly mechanism 3 above the clamping mechanism 2, and a detection mechanism 4 on the assembly mechanism 3.

[0035] Please see Figure 1 and Figure 2 The clamping mechanism 2 includes an electric turntable 21 rotatably mounted on a drive table 1 and driven by the drive table 1 for directional rotation adjustment. The electric turntable 21 is provided with a horizontal positioning part 22 that horizontally supports and internally positions the spokes 500. The electric turntable 21 and the horizontal positioning part 22 are jointly provided with an alignment locking part 23 that locks the assembly of the spokes 500 and the rim 600 and allows for direct welding operations. The electric turntable 21 is provided with a transverse movement drive part 24 for left and right movement adjustment. The transverse movement drive part 24 is provided with a concentric limiting part 25 that vertically positions the rim 600 and locks its concentric position relationship with the spokes 500.

[0036] Please see Figure 2 , Figure 5 and Figure 6The horizontal positioning part 22 includes an adjusting shaft 221 that is slidably mounted on the electric turntable 21 and moves up and down. A convex ring is fixedly mounted in the middle of the adjusting shaft 221 and above the electric turntable 21. A fixed plate 222 that is elastically connected to the electric turntable 21 by a spring is fixedly mounted on the upper side of the adjusting shaft 221. A support plate 223 is fixedly mounted on the upper side of the fixed plate 222 by a plurality of evenly distributed connecting rods. A pneumatic clamping platform 224 is fixedly mounted inside the support plate 223. A plurality of grippers are evenly slidably mounted on the upper side of the pneumatic clamping platform 224.

[0037] By placing the middle part of the spoke 500 horizontally on the upper side of the support plate 223, the spoke 500 can be stably and horizontally supported. At the same time, the pneumatic clamping table 224 drives each clamp inside the inner hole of the spoke 500 to move synchronously away from the axis of the pneumatic clamping table 224. The spoke 500 can be stably and internally supported and fixed on the upper side of the support plate 223 by the clamps.

[0038] It should be noted that the flatness and levelness of the support plate 223 have been precisely designed and processed to ensure that the spokes 500 can be placed stably and accurately at a horizontal position, and that the movement of the multiple grippers driven by the pneumatic clamping table 224 can be synchronized and precise. At the same time, the selection of the spring and the elastic coefficient are precisely calculated by those skilled in the art to ensure that when the spokes 500 are placed on the support plate 223, the fixed plate 222 and the adjusting shaft 221 will not experience significant and continuous up-and-down shaking, thereby ensuring the stability of the support plate 223 supporting the spokes 500 and the pneumatic clamping table 224 clamping the spokes 500.

[0039] Please see Figure 2 , Figure 3 and Figure 6 The alignment locking part 23 includes an insertion hole 231 opened on the right side of the lower end of the adjusting shaft 221. An electric push rod 232 is fixedly installed on the lower side of the electric turntable 21 through a support. The telescopic end of the electric push rod 232 is fixedly provided with a pin 233 that moves left and right and is inserted into the insertion hole 231.

[0040] As the support plate 223 moves downward under the action of the assembly mechanism 3, the support plate 223 drives the pneumatic clamp 224, the fixed plate 222 and the adjusting shaft 221 to move downward synchronously until the convex ring on the adjusting shaft 221 is in contact with the upper surface of the rotating plate and can no longer move downward. At this time, the insertion hole 231 at the lower end of the adjusting shaft 221 is aligned with the pin 233. The electric push rod 232 drives the pin 233 to move to the right and insert it into the insertion hole 231, thereby stabilizing the fixed plate 222 and the support plate 223 on the upper side of the adjusting shaft 221 at the current position.

[0041] Please see Figure 2 , Figure 5 and Figure 7The lateral drive unit 24 includes two fixed platforms 241 that are symmetrically fixed on the upper side of the electric turntable 21. Each fixed platform 241 has a cylinder 242 fixed on its opposite side. The telescopic end of the cylinder 242 is fixedly provided with a connecting plate 243 that moves left and right and is located on the opposite side of the two fixed platforms 241. The side of the connecting plate 243 close to the corresponding cylinder 242 is evenly provided with a plurality of guide rods that are slidably connected to the corresponding fixed platform 241.

[0042] Please see Figure 2 , Figure 5 and Figure 7 The concentric limiting part 25 includes two connecting plates 243, which are fixedly arranged on opposite sides with a pressure stabilizing half ring 251 and an outer support half ring 252. The splicing axis of the two pressure stabilizing half rings 251 and the two outer support half rings 252 coincides with the axis of the pneumatic clamp 224. The lower end of the opposite side of the two pressure stabilizing half rings 251 is an inclined surface.

[0043] When the wheel rim 600 is to be vertically clamped onto the electric turntable 21, the wheel rim 600 is first placed between the two stabilizing semi-rings 251 and the outer support semi-ring 252. Then, the cylinder 242 drives the two connecting plates 243 to move synchronously relative to each other. The connecting plates 243 then drive the corresponding stabilizing semi-rings 251 and the outer support semi-rings 252 to move synchronously until the two stabilizing semi-rings 251 and the two outer support semi-rings 252 are stably spliced ​​together, and the splicing axis coincides with the axis of the pneumatic clamping table 224. At the same time, during the movement of the connecting plates 243, the stabilizing semi-rings 251 first pass through the lower inclined surface and engage with the wheel rim. The upper end of 600 presses against the rim 600 to stabilize and correct it, so that the lower end face of the rim 600 is stably attached to the upper surface of the electric turntable 21 and remains vertical. The outer support half ring 252 then fits and limits the vertical rim 600 and provides stable rigid support to the outer side of the middle part of the rim 600. At this time, the support plate 223 and the pneumatic clamp 224 provide horizontal support and internal support for the spokes 500 placed in the rim 600, so that the spokes 500 and the rim 600 can stably maintain a high degree of verticality and concentricity in the initial state before assembly.

[0044] It should be noted that the high-precision assembly of the two pressure-stabilizing semi-rings 251 and the two outer support semi-rings 252, as well as the high-precision alignment of the assembled shaft center with the pneumatic clamping platform 224 shaft center, are ensured by the precision machining of core components, strict assembly process standards, and a real-time position sensing feedback system. Furthermore, the pressure-stabilizing semi-rings 251 and their lower inclined surfaces that press against the upper end of the rim 600 are precisely calculated and manufactured to ensure the accuracy of the correction and stable positioning of the upper end of the rim 600. At the same time, the outer support semi-rings 252, after assembly, do not apply active clamping pressure to the center of the rim 600. Their function is to precisely limit the rim 600 to a position concentric with the spokes 500, while providing the necessary stable rigid support for the rim 600.

[0045] Please see Figure 1 The assembly mechanism 3 includes a lifting shaft 31 that is positioned above the electric turntable 21 and moves up and down. The lifting shaft 31 is fixedly connected to an external hydraulic lifting device (not shown in the figure). The lower side of the lifting shaft 31 is provided with a pressing assembly part 32 that works with the horizontal positioning part 22 to stabilize and limit the wheel spokes 500 horizontally and to press them down vertically. The pressing assembly part 32 is provided with an inner support fitting part 33 that evenly presses and fits the inner side of the outer edge of the wheel spokes 500.

[0046] Please see Figure 1 , Figure 2 , Figure 8 and Figure 9 The pressing assembly 32 includes a movable disk 321 fixedly disposed on the lower side of the lifting shaft 31. Multiple abutment sleeves 322 are evenly fixedly disposed on the lower circumferential side of the movable disk 321. A sliding rod 323 that slides through the movable disk 321 and the abutment sleeves 322 are slidably disposed on both the movable disk 321 and the sliding rod 323. A pressure plate 324 that is elastically connected to the movable disk 321 by a spring is fixedly disposed on the lower side of all the sliding rods 323.

[0047] When the lower surface of the pressure plate 324 is driven by the lifting shaft 31 to stably fit against the upper surface of the middle part of the spoke 500 which is placed horizontally on the upper side of the support plate 223, the spoke 500 can stably maintain a horizontal state under the fitting action of the pressure plate 324 and the support plate 223. At this time, the spoke 500 is then clamped by the gripper to prevent fluctuations in the horizontal fitting accuracy between the spoke 500 and the support plate 223 during the clamping process.

[0048] It should be noted that the lower surface of the pressure plate 324 has extremely high levelness and flatness to ensure perfect parallel correspondence with the upper surface of the support plate 223. This allows the pressure plate 324 to achieve uniform and full contact with the spokes 500 during the pressing process, and ensures that the spokes 500 do not tilt or shift in any way while applying axial pressure. Thus, the spokes 500 can be rigidly constrained by the precise fit between the pressure plate 324 and the support plate 223. At this time, the internal support force applied by the gripper will not cause any disturbance to the posture and fitting accuracy of the spokes 500.

[0049] Please see Figure 1 , Figure 2 , Figure 4 and Figure 9 The inner support fitting part 33 includes a connecting sleeve 331 fixedly disposed on the outside of the movable disk 321. A driven disk 332 is fixedly disposed on the lower outer side of the connecting sleeve 331. An inner support pressure sleeve 333 is fixedly disposed on the lower side of the driven disk 332. The shape of the lower end and outer surface of the inner support pressure sleeve 333 can stably fit tightly against the inner curved surface of the outer edge of the spoke 500 and the inner wall of the rim 600 without gap.

[0050] Please see Figure 1 and Figure 2 The detection mechanism 4 includes an outer edge stabilizing part 41 disposed on the inner support fitting part 33 and used to synchronously press down on the outer edge of the spoke 500 and detect the shape change of the outer edge of the spoke 500 during the assembly process and after the assembly is completed. The inner support fitting part 33 and the outer edge stabilizing part 41 are jointly provided with a lifting adjustment part 42 for vertical movement adjustment. The lifting adjustment part 42 is provided with a gap detection part 43 for detecting the assembly and fitting gap between the outer edge of the spoke 500 and the inner wall of the rim 600.

[0051] Please see Figure 2 , Figure 4 and Figure 9 The outer edge pressure stabilizing part 41 includes a plurality of limiting sleeves 411 that are circumferentially and uniformly fixed on the upper side of the driven disk 332. A second abutting sleeve 412 corresponding to and communicating with the limiting sleeves 411 is fixedly provided on the lower side of the driven disk 332. A second sliding rod 413 that moves up and down is elastically slidably provided in the limiting sleeves 411 and the corresponding second abutting sleeve 412 through a spring 3. A detection pressure ring 414 that fits against the upper end of the outer edge of the spoke 500 and has a pressure sensor installed inside is fixedly provided on the lower side of all the second sliding rods 413.

[0052] When the vertical and concentric spokes 500 and rim 600 are to be pressed together, the lifting shaft 31 and the moving disk 321 continue to move downward. Under the support of the spring pair of support disks 223 and spokes 500, the moving disk 321 first drives each abutment sleeve 322 to move downward synchronously along the slide rod 323 and squeeze each spring. The connecting sleeve 331 and the driven disk 332 also drive the inner support pressure sleeve 333, the limit sleeve 411 and the abutment sleeve 412 to move downward synchronously. Under the action of the spring, the slide rod 413 drives the detection pressure ring 414 to fit against the upper end of the outer edge of spokes 500. As the lower end of the abutment sleeve 322 contacts the pressure disk 324 and drives it to press down synchronously, the spokes 500 In the middle, the lower end of the clamping sleeve 412 also contacts the detection pressure ring 414 and drives it to press down synchronously on the outer edge of the spoke 500. The lower end and outer side of the inner support pressure sleeve 333 also gradually come into contact with and fit against the inner side of the outer edge of the spoke 500. Thus, through the synchronous pressing action of the pressure plate 324, the detection pressure ring 414 and the inner support pressure sleeve 333, the middle part of the spoke 500 and the outer edge of the spoke 500 are synchronously and gradually pressed into the inside of the rim 600. At the same time, the outer side of the outer edge of the spoke 500 also gradually and evenly fits tightly against the corresponding position of the inner wall of the rim 600, which is rigidly supported by the outer support half ring 252, until the adjusting shaft 221 can no longer move down. At this time, the spoke 500 is also assembled to the required depth inside the rim 600 (e.g., Figure 11 (As shown).

[0053] Among them, the pressure sensor of the pressure ring 414 can accurately monitor the real-time deformation of the outer edge of the spoke 500 during the assembly process, as well as the uniformity of the overall compression and bonding between the outer edge of the spoke 500 and the inner wall of the rim 600 after assembly, thereby ensuring the uniformity, stability and consistency of the assembly of the spoke 500 and the rim 600.

[0054] It should be noted that the selection of springs 2 and 3 and the magnitude of their elastic coefficients were obtained through precise calculations by those skilled in the art to ensure that the elastic support force of spring 1 is much greater than the compressive deformation force of springs 2 and 3. This ensures that springs 1 will not deform synchronously during the compression process of springs 2 and 3, thus guaranteeing the stability and controllability of the relative position of wheel spokes 500 and wheel rim 600 during the overall assembly process.

[0055] The above-mentioned operation method can significantly improve the overall precision, uniformity and consistency of the assembly of the 500 spoke and 600 rim, providing a stable and reliable welding foundation for subsequent welding processes.

[0056] After the spokes 500 and rim 600 are assembled, the adjusting shaft 221 is locked in its current position. Then, the lifting shaft 31 drives the moving plate 321, driven plate 332, and inner support sleeve 333 to move upwards synchronously. Springs 2 and 3 gradually return to their elastic state, pressing the pressure plate 324 to maintain a stable fit with the center of the spokes 500, and pressing the detection ring 414 to maintain a stable fit with the upper outer edge of the spokes 500. Thus, the pressure plate 324 and detection ring 414 ensure that the spokes 500 remain stably horizontal after assembly and before complete unloading. The stabilizing half-ring 251 and outer support half-ring 252 ensure that the rim 600 remains horizontal after assembly. Maintaining a vertical position ensures that the assembled spokes 500 and rim 600 maintain high verticality and concentricity during unloading. As the pressure from the pressure plate 324 and the detection pressure ring 414 gradually weakens on the spokes 500, the outer edge of the spokes 500 gradually releases the assembly stress accumulated during assembly. The detection pressure ring 414, which remains in contact with the outer edge of the spokes 500, can monitor the deformation state and uniformity of the outer edge of the spokes 500 in real time through an internal pressure sensor. This allows for stable control of the assembly state of the spokes 500 and rim 600 during unloading, ensuring that the spokes 500 and rim 600 maintain a high-precision assembly state even after complete unloading.

[0057] It should be noted that, through precise calculation and design by those skilled in the art, and by using the high-sensitivity pressure sensor array built into the pressure ring 414, the pressure sensor can accurately detect the force changes and force distribution at various positions at the lower end of the pressure ring 414. This allows for real-time monitoring and feedback of the deformation state and circumferential uniformity of the outer edge of the spoke 500 during stress release, thereby achieving precise control over the assembly state of the spoke 500 and the rim 600 throughout the unloading process. This ensures that even after complete unloading, the spoke 500 and the rim 600 can still maintain a high-precision assembly state that meets design expectations.

[0058] After unloading the spoke 500 and rim 600 assembly, the rim 600 and spoke 500 locked on the upper side can be driven by the electric turntable 21 to rotate synchronously and oriented, thereby cooperating with the welding gun (not shown in the figure) controlled by the external robotic arm to continuously weld and fix the assembly edges of spoke 500 and rim 600. After welding is completed, the limit of rim 600 can be released first, and then the locking of adjusting shaft 221 can be released. Spring 1 will then drive spoke 500 and rim 600 assembly on fixed plate 222 to rise upward to facilitate manual or external transfer equipment (not shown in the figure) to pick up the material. Finally, the inner support clamp of spoke 500 can be released, thereby completing the unloading of spoke 500 and rim 600 assembly.

[0059] The above-described operation method allows the 500 spoke and 600 rim assembly to be directly welded without the need for transport, transfer, or secondary assembly. This not only reduces investment and maintenance costs but also avoids external disturbances that may occur during assembly transfer. Furthermore, it avoids positioning errors that may be introduced by secondary clamping. As a result, it significantly improves the production cycle and efficiency of the wheel hub while ensuring the consistency of the precision and quality of the welded joints of the 500 spoke and 600 rim assembly.

[0060] Please see Figure 2 , Figure 4 , Figure 8 and Figure 9 The lifting adjustment part 42 includes an L-shaped slide 421 that is slidably disposed on the outside of the limiting sleeve 411 and moves up and down. Electric push rods 422 are symmetrically fixed on the upper side of the driven plate 332. The telescopic end of the electric push rod 422 is fixedly connected to the horizontal section of the corresponding L-shaped slide 421 through the support 2.

[0061] Please see Figure 2 , Figure 4 , Figure 8 and Figure 10The gap detection unit 43 includes a lifting ring 431 that is fixedly installed on the lower side of the vertical section of all L-shaped carriages 421 and located outside the driven plate 332. A pressure sensor is installed inside the lifting ring 431. A detection plug 432 is fixedly installed on the lower side of the lifting ring 431. The detection plug 432 is composed of an annular piece fixedly connected to the lower surface of the lifting ring 431 on the upper side and a plurality of inverted triangular thin pieces that are evenly distributed circumferentially on the lower side and have pointed ends. The inverted triangular thin pieces are inclined inward towards the annular piece.

[0062] After the stress release is completed in the assembly of the spokes 500 and rim 600, the electric actuator 422 drives the corresponding support 2 and L-shaped slide 421 to move downward along the corresponding limiting sleeve 411. The corresponding L-shaped slide 421 then drives the lifting ring 431 to move downward synchronously. The lifting ring 431 then drives the remaining L-shaped slide 421 and the detection plug 432 on the lower side to move downward synchronously. The tip of the inverted triangular thin plate on the lower side of the detection plug 432 is then pressed against the edge of the assembly gap between the spokes 500 and the rim 600, and the pressure resistance is accurately fed back by the pressure sensor inside the lifting ring 431. If each inverted triangular thin plate is pressed against the edge of the assembly gap between the spokes 500 and the rim 600, the pressure resistance is accurately fed back by the pressure sensor inside the lifting ring 431. If the compressive resistance of the triangular sheet is below the set value and unevenly distributed, it indicates that the assembly gap in some areas of the assembly exceeds the thickness of the inverted triangular sheet, which is a significant gap that does not meet the design requirements. In this case, the spokes 500 and rim 600 need to be re-pressed and reassembled or adjusted accordingly. If the compressive resistance of each inverted triangular sheet is within the set value range and evenly distributed, it indicates that the assembly gap of the assembly is less than the thickness of the inverted triangular sheet, which is an assembly gap that meets the design requirements. The spokes 500 and rim 600 assembly can then proceed with subsequent welding processing.

[0063] It should be noted that, through precise calculation and design by those skilled in the art, and through the high-sensitivity pressure sensor array built into the lifting ring 431, the internal pressure sensor of the lifting ring 431 can stably detect the precise force changes and force distribution of each inverted triangular sheet, thereby accurately monitoring and providing feedback on the assembly gap between the spoke 500 and the rim 600; at the same time, the number, thickness, distribution, downward movement distance of the inverted triangular sheets, and the standard set value range of the extrusion resistance at the edge of the assembly gap are all precisely calculated and designed by those skilled in the art, thereby enabling precise and uniform control of the assembly gap between the rim 600 and the spoke 500.

[0064] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0065] Furthermore, the terms "first," "second," "number one," and "number two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "number one," or "number two" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0066] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0067] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A welding fixture for automotive stamping parts, comprising a drive table, characterized in that: The drive platform is equipped with a clamping mechanism, an assembly mechanism is located above the clamping mechanism, and a detection mechanism is located on the assembly mechanism. The clamping mechanism includes an electric turntable rotatably mounted on a drive platform. The electric turntable is provided with a horizontal positioning part, and the electric turntable and the horizontal positioning part are jointly provided with an alignment locking part. The electric turntable is provided with a transverse drive part, and the transverse drive part is provided with a concentric limiting part. The horizontal positioning part, in conjunction with the concentric limiting part, precisely locks the horizontal wheel spokes and the vertical wheel rim into a vertical and concentric positional relationship. The assembly mechanism includes a lifting shaft located above the electric turntable, and a pressing assembly part located on the lower side of the lifting shaft. The pressing assembly part and the horizontal positioning part are used to vertically press and assemble the horizontal wheel spokes. An inner support fitting part is provided on the pressing assembly part, which synchronously and evenly presses the inner side of the outer edge of the wheel spokes. The horizontal positioning part includes an adjusting shaft that is slidably mounted on an electric turntable. A fixed plate that is elastically connected to the electric turntable is fixedly mounted on the upper side of the adjusting shaft. A support plate is fixedly mounted on the upper side of the fixed plate through a connecting rod. A pneumatic clamping platform is fixedly mounted inside the support plate. The transverse drive unit includes two fixed platforms symmetrically fixed on the upper side of the electric turntable. A cylinder is fixedly installed on the opposite side of each of the two fixed platforms, and a connecting plate is fixedly installed on the telescopic end of the cylinder. The concentric limiting part includes a pressure-stabilizing half-ring and an outer support half-ring, which are fixedly arranged on opposite sides of two connecting plates. The splicing axis of the two pressure-stabilizing half-rings and the two outer support half-rings coincides with the axis of the pneumatic clamp. The lower end of the opposite side of the two pressure-stabilizing half-rings is an inclined surface. The pressing assembly includes a movable disk fixedly installed on the lower side of the lifting shaft. Multiple abutting sleeves are evenly fixedly installed on the lower side of the movable disk. A sliding rod is slidably installed on both the abutting sleeves and the movable disk. A pressure plate that is elastically connected to the movable disk is fixedly installed on the lower side of all the sliding rods. The detection mechanism includes an outer edge stabilizing part installed on the inner support fitting part and detecting the shape change of the outer edge of the wheel spoke during assembly and unloading. The outer edge stabilizing part presses down on the outer edge of the wheel spoke simultaneously. The inner support fitting part and the outer edge stabilizing part are both provided with a lifting adjustment part, and the lifting adjustment part is provided with a gap detection part for detecting the assembly gap between the wheel spoke and the wheel rim.

2. The welding fixture for automotive stamping parts according to claim 1, characterized in that: The alignment and locking part includes an insertion hole at the lower end of the adjusting shaft, and an electric push rod is fixedly installed on the lower side of the electric turntable. The telescopic end of the electric push rod is fixedly provided with a pin that engages with the insertion hole.

3. The welding fixture for automotive stamping parts according to claim 1, characterized in that: The inner support fitting part includes a connecting sleeve fixedly installed on the outside of the movable disk, a driven disk fixedly installed on the lower outer side of the connecting sleeve, and an inner support pressure sleeve fixedly installed on the lower side of the driven disk.

4. The welding fixture for automotive stamping parts according to claim 3, characterized in that: The outer edge pressure stabilizing part includes multiple limiting sleeves uniformly fixed on the upper side of the driven plate, and a second abutting sleeve corresponding to the limiting sleeve is fixedly fixed on the lower side of the driven plate. A second sliding rod is elastically slidably arranged in both the limiting sleeve and the corresponding second abutting sleeve, and a detection pressure ring is fixedly arranged on the lower side of all the second sliding rods.

5. A welding fixture for automotive stamping parts according to claim 4, characterized in that: The lifting adjustment unit includes an L-shaped slide that is slidably disposed on the outside of the limiting sleeve, and two electric push rods are symmetrically fixedly disposed on the upper side of the driven plate. The telescopic end of the electric push rod is fixedly connected to the corresponding L-shaped slide.

6. A welding fixture for automotive stamping parts according to claim 5, characterized in that: The gap detection unit includes a lifting ring that is fixedly installed on the lower side of all L-shaped carriages. A detection plug is fixedly installed on the lower side of the lifting ring. The detection plug consists of an annular piece fixedly connected to the lifting ring on the upper side and multiple inverted triangular thin pieces evenly distributed on the lower side with pointed ends.

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